/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Changes/IndexedAttributeChange.h
This is an abstract base class, you must provide suitable Apply/Revert implementations. TheTCustomIndexedValuesChangesubclass will allow you to do this with lambdas.
template<typename ValueType> class TIndexedValuesChange : public [FToolCommandChange](API\Runtime\InteractiveToolsFramework\FToolCommandChange)
TArray< int32 >
Indices
TArray< ValueTy...
NewValues
TArray< ValueTy...
OldValues